Headstock for machine tools



Allgv 20, 1935 F. s. HAAs ET AL 2,012,066

HEADSTOCK FOR MACHINE TOOLS Filed March 3, 1934 2.Sheets-Sheet l J7 fa.Vig

Aug. 20, 1935. l F HAAS Er AL 2,012,066

HEADSTOCK FOR MACH-INE TooLs Filed Maron 5, 1954 2 sheets-sheet 2Patented ug. 20, 1935 tuY STATES 2,012,066 lHEADSTOCK FOR MACHINE TOOLSFrederick S.- Haas and Edgar D. Vancil, Cincinnati, Ohio, assignors toCincinnati Grinders Incorporated, Cincinnati,

of Ohio Ohio, a corporation Application March 3, 1934, Serial No.713,887

6 Claims.

This invention relates to improvements in machine tools and particularlyto improvements in grinding machines, lathes and like tools.

One of the principal objects of the present invention is therefore theprovision of an improved grinding vmachine and particularly the workterminal supporting mechanism of sucha machine, such as the headstock.

Another object of the invention is the provision of a headstockparticularly adapted for machines which operate on large Work piecessuch as the rolls used in paper and steel mills.

A further object of the invention is the provision of a fabricatedstructure, that is a headstock mechanism of improved design and foxmcompletely of welded sheets.

A still further object of the invention is the provision of a headstock,as just referred to, which co-operates with a bed or supportingmechanism of similar fabricated construction which provides mechanismco-operating with the said immediate headstock.

Other objects and advantages of the present invention should be readilyapparent by reference to the following specification, considered inconjunction with the accompanying drawings forming a part thereof and itis to be understood that any modications may be made in the exactstructural details there shown and described, within the scope of theappended claims, Without departing from or exceeding the spirit of theinvention.

In the drawings;

Figure 1 is a front elevation of a grinding machine embodying theimprovements of the invention. Y

Figure 2 is a transverse sectional view taken substantially on line 2--2of Figure 1.

Figure 3 is a longitudinal sectional View taken on line 3-3 of Figure 2.

Figure 4 is a horizontal sectional view taken on line 4 3 of Figure 2.

Throughout the several views of the drawings similar referencecharacters are employed to denote the same or similar parts.

The grinding machine as shown in the drawings comprises a plurality ofblocks I0 mounted on a concrete floor Il. I0 is a bed I2 formed bywelding longitudinal and transverse members to one another. To the bedI2 on the upper surface is provided a headstock base I3 from whichproject the usual guide ways I4. Mounted on the guide ways It at one endthereof is a tailstock I5 adapted to be shifted relative to the ways I4toward and from the head- Supported on the blocks stock base I3. Mountedon the ways I4 between the headstock base I3 and the tailstock I5 arejournal'rests I6 and Il which support the work while being rotated andtooled.

Behind the work I3 is disposed a tool carriage I9 supporting a primemover or electric motor 20. The electric motor 20 is belted. orotherwise connected with the spindle 2| of the carriage for effectingits rotation.v Fastened to one end of the spindle 2l is a grinding wheel22.

The headstock base I3 comprises a lower plate 22 whichextends the fullwidth of the bed Ill as seen in Figure 2. The base plate 22 is securedto the bed I0 by suitable welding and the like 23. Welded to the uppersurface of the plate 22 are longitudinal bars 23 and 25, and similarlywelded to the ripper surface of said plate 22 between the bars 24 and 25are the transverse bars 26 and 2I. From the foregoing it will be notedthat the headstock base I3 has a rectangular boxlike form and this boxconstitutes a lubricant reservoir for holding lubricant oil to besupplied to the rotating parts of the headstock.

The headstock, itself indicated generally by the numeral 28, comprises asubstantially oval shaped member 29 formed by bending a single sheet ofsteel. One of the long sides of the member 29 is cut away, and weldedinto the opening thereof is a frame 30 having formed therethrough anopening 3| co`extensive with the area formed interiorly of the bars 2t,25, 26 and 21.

Extending transversely of the body member 29 and conforming to thecontour thereof are transverse plate l'nembers v32 and 33. The members32 and 33 are secured in position by being welded along each edge to thebody member 29 and the frame 30. The cross members 32 and 33 are eachprovided with a pair of bores or holes 34 and 35 and 3B and'3l. Weldedinto the bore 34 of the member 32 is a, sleeve 38 which is in axialalignment with a sleeve 39 Welded in the bore 36in the member 33.

The sleeves 38 and 39. have secured therein a spindle 30 which is heldagainst any movement relative to the said sleeves by sweating the samein position. From'this it will be seen that the headstock of the presentinvention is of the dead spindle type, that is, one wherein the spindleis not rotated with the work. At the head end of the spindle it hasprojecting therefrom a center il which is in axial alignment with acenter 42 projecting from the tailstock I5, the said centers determiningbetween them the initial axis of rotation of the work I8 and furtheracting as terminal abutments for the work during the tooling or grindingthereof.

By reference to Figure 3 it will be noted that the spindle 48 projectsrearwardly of the sleeve 38 where it is reduced in diameter as at 43.Mounted on the sa'id reduced end 43 of the spindle is a bushing 44forming a bearing for a rotatable sleeve 45. The sleeve 45 has formedintegral therewith a chain sprocket 46 and has keyed or otherwisesecured thereto a pulley, sheave or the like 41. As shown in thedrawings, the member 41 is a sheave having formed therein a pluralityoi' grooves for the exible transmission members or V belts 48. Thebelts-48 are in turn trained to a driving sheave 49 keyed. or otherwisesecured to the shaft 50 of the motor or prime mover 5|. From this willbe seen that the driving sleeve 45 is adequately rotated from the motor5|.

The bore 35 in the headstock transverse member 32 is in axial alignmentwith the bore 31 in the member 33 and respectively mounted in said boresare the outer races 52 and 53 of anti-friction bearings 54 and 55. Thesebearings 54 and 55 support for rotation a counter or jackshaft 5 6 whichprojects beyond the said supporting bearings. The portion of the shaft56 which projects beyond the transversemember 32 is tapered as at 51 andhas keyed or otherwise secured thereto a large silent chain gear 58. Thechain gear 58 is in alignment with the chain sprocket 46 of the drivingsleeve 45 and the said sprocket and key- Way have trained about them asprocket chain 59. The sprocket chain 59 transmits motion from thedriving sleeve 45 to the jackshaft 56.

. The end of the jackshaft 56 which projects beyond the traverse member33 is provided with a tapered portion as at 60 to which is keyed orotherwise secured a silent chain sprocket 6|. The sprocket 6| hastrained thereabout a chain 62, in turn extending about a relativelylarge sprocket gear 63. The gear 63 is, therefore, in alignment with'the sprocket 6| and the said gear includes a hub 64 which is mounted ona bushing 65 fastened to the spindle supporting sleeve 39.

The hub 64 of the gear 63 is provided with a reduced portion on which isiitted a face plate 66. In addition, the gear 63 has welded or otherwisesecured thereto a ring member 61 provided with threaded bores receivingscrews 68 which pass through plain bores formed in the plate 66.

Secured in any desirablemanner to the face plate 66 is a chuck ordriving plate mechanism indicated generally by theI numeral 69 andincluding the driving dogs 10 which when connected with the Work eiectits rotation.

' From the foregoing it will now be seen that the transmission train forrotating the work comprises the motor sheave 49 and compound sheavesprocket 41-46 carried by the rear end of the spindle and connected tothe motor sheave by the belts 48. From the compound sheave sprocket41-46 extends the belt v59 for rotating the jacklshaft 56 through thechain 59 and sprocket gear 58. A similar chain 62 driven-by a chainpinion on the'shaft 56 rotates the bull gear 63 associated with the faceplate and work driving assembly.

1n view of the massiveness of the parts involved in the headstock ofthis invention the bull gear 63 andchain gear 58 act as fly wheels orstabilizers lWhen the work is set in motion and prevent to a surprisingextent the formation of chatter marks,

atsand the like on the work.

In order to lubricate the several rotatable members of the headstockassembly the headstock frame plate 3|! has welded thereto rnd.projecting/'therefrom in overlying relationship to the motor basereservoir, a shelf 1| which supports a. pump 12 adapted to circulate thelubricant. The .pump 12 is driven by a chain 13 which extends about agear or the like 14 associated with the pump 12 and a driving sprocket15 keyed or otherwise secured to the jackshaft 56.

The pump 12 has extending'froin one side thereof a suction pipe or line16 which terminates at its other end at the base of the lubricantreservoir. Extending from the other side of the pump 12 is the dischargeline 11 which empties into a second pipe or conduit 18 through an oilfilter'l or the like 19. The upper end of the pipe anconduit' 18 emptiesinto an oil well indicated generally by the numeral located above thebearings of the rotation members of the headstock assembly.

The oil well 60 is formed between the traverse members 32 and 33 by apair of side plats 8| and 82 having their upper longitudinal edgeswelded to the under surface of thetop portions of the headstock housing.29 and a bottom member 83 having its longitudinal edges welded to theside plates 8| and 82; The ends of both the side members 8| and 82 andthe bottom member 83 are respectively welded to the traverse members 32and 33. From this it will be seen that there has been provided a box oroil well which will contain a quantity of lubricant delivered thereto,as above explained, by the pump 12 from the reservoir. Access may be hadto the well 80 through an aperture formed in the top of the housingmember 29 and covered by a suitable cover plate 84.

It is through one of the oil well side members, 8| for example, that thelubricant is delivered to the well. For this reason the said side memberhas a coupling 85 therein to whichA the upperv a series of dischargepipes or conduits 86 which.

terminate in the several rotatable bearings of the jackshaft, sheavepinion unit i1-46 and face plate assembly 66. For example, dischargepipe or conduit 86a from the oil well terminates in a duct or port 81formed in the sleeve member 39, which duct through additional ports orducts 88 lubricate the bearing on which the bull gear 63 or face plateassembly rotates. Also, the discharge pipe or conduit 86e terminates ata port 91 in the sleeve 38 which through the cross and longitudinalports 98 lubricates the bearing for the compound sheave-pinion unit41-46. Again, pipes 86h and 66e terminate at the anti-friction'bearings54 and 55 respectively for lubricating the said bearings, while thejackshaft 56 is being rotated and the pipe 86d extends throughthetransverse member 33 to overlie the chain 62 thereby supplying lubricantthereto during the driving thereof. pipes or conduits extend from theWell to all of the bearings and parts within the headstock which needlubricant and from which it will be seen that the said bearings areadequately lubricated during the operation of the headstock.

The lubricant, upon passing through the bearings which they lubricate,falls by gravity to the frame plate 30 from which the lubricant iindsits way to the reservoir in the vheadstock base I3. To insure thelubricant being returned to the lowest point of said reservoir where thesuc.,

seen in Figure 2.- The drain board or plate 89 is welded at one en d tothe longitudinal bar 24 Other .thel interior y of'the enveloping member,said transverse spacedmember's having aligned bores and at the other endto a riser 90 held in position by welding its lower end to the baseplate 22.

The headstock, as a whole, is securely attached to the base I3 by aplurality .of bolts 9i and.,92

to the inner surface offthe'housing member 29 and the upper surfaceofthe frame plate 3U and'y adjacent to the lateral edges thereof areblocks 93 through which are formed threadedperforations. Lyingadjacent-thesaid lateral edges of the headstock housing 29 are coverplates 94 and 95 through which pass cap screws 96 threaded into thethreaded bores in the blocks 93. By this construction the headstock iscompletely enclosed, yet the interior of the headstock may be readilyreached to adjust or inspect the, chains 59 and 62 by merely removingthe plates 94 and What is claimed is: y 1. Av fabricated headstock foruse with machine tools comprising an enveloping member formed y bybending'to properform a single sheet of rmaterial, a pair of spacedtransverse members interiorly of the enveloping member and welded to theinner surface thereof, a frame at the lower end of the enveloping memberhaving an aper-v ture therethrough whereby access may be had to theinterior of the enveloping member, said .Y

transverse spaced members having aligned bores therein, and a pair ofspindle supporting sleeves welded to said transverse memberswithin thealigned bores.

2. A fabricated headstock for use with machine tools comprisingari-enveloping member formed by bending to proper form a single sheet ofmaterial, a pair of spaced transverse members interiorly of theenveloping member and welded to the inner surface thereof, a frame atthe lower end of the enveloping member having an aperture therethroughwhereby access may be had to the interior of the enveloping member, saidtransverse spaced members having aligned bores therein, a pair ofspindle supporting sleeves welded to said transverse members within thealilned bores, and cover plates for the edges of they enveloping memberfor completely enclosing the same.

3.. A fabricated headstock for use with machine tools comprising anenveloping member formed by bending to proper form a single sheet ofmaterial, a pair of spaced transverse members interiorly of theenveloping member and welded to the inner surface thereof, a frame atthe lower end of the enveloping member having anaperture therethroughwhereby access may be had to chine ,tools :comprising an rformed bybending to proper of material, apairvof spaced transverse membersvinteriorly ofthe enveloping member and welded as by welding, atsuitable lintervals,

therein, a pair .of spindle lsupporting sleeves -V welded 'tolsaidtransverse members ,Within the aligned bores,`an loil reservoir withinthe enveloping member and formed by Welding side and base plates to theenveloping member and transverse .members and means for supplyinglubricant tothe well.

1l-A yfabricated'.headstock for use with maenveloping member form asingle sheet to the inner surface thereof, a frame at the lower endofthe enveloping member having an aperture. therethrough whereby accessmay be had to the interior of the enveloping member, said transversespaced members having aligned bores therein, a pair of spindlesupporting sleeves welded to said transverse members within the alignedbores,an l roil reservoir within the enveloping member and formed bywelding side and base plates tothe enveloping member and transversemembers,` means for supplying lubricant to the well, a supporting basefor the headstock. having an area substantially (so-extensive with theheadstock frame; said base having a compartment formed therein inalignment with the aperture in the headstock frame, and means forsecuring the headstock to the base.

5. In a headstock of the class described the combination of a housingmember including a. pair of transverse supports, a supporting sleevesecured to each of said supports, a spindle carried by the sleevesagainst rotation, a driven member loosely journaled on the spindle, aface plate loosely ljournaled on one of the supporting sleeves, a jackshaft rotatably mounted in the transverse supporting members, a exibletransmission between the driven member on the spindle and the jackshaft, and a second flexible transmission between the jack shaft'andface plate whereby the face plate is rotated.

6. In a headstock of the class described the Lcombination of a housingmember including a ,a jack shaft rotatably mountedin the transversesupporting members, a flexible transmission between the driven member onthe spindle and the jack shaft, a second flexible transmission betweenthe jack shaft and face plate whereby the face plate is rotated, and aprime mover connected with the spindle driven member.

FREDERICK S. HAAS. EDGAR D. VANCIL.

